I'm not sure why no one has ever responded to this. Anywho, I've played around with digital backdrops a little, but I like using printed photography backdrops better. Printed backdrops look just as realistic, but in the end the overall portrait looks more realistic (in my opinion) because you can do a more accurate lighting match. If you use a green screen, you can only imagine in your mind what a good lighting match would look like, but with with a printed backdrop, you can see the foreground subject and the background both right in front of you, and tweak them until they match up. I just haven't seen enough digital backdrop shots that impress me. I use Photo Pie backdrops for this type of shot in my studio.